package com.example.springcloud.controller;

import com.alibaba.csp.sentinel.annotation.SentinelResource;
import com.alibaba.csp.sentinel.slots.block.BlockException;
import com.example.springcloud.entities.CommonResult;
import com.example.springcloud.entities.Payment;
import com.example.springcloud.service.PaymentService;
import lombok.extern.slf4j.Slf4j;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.client.RestTemplate;

import javax.annotation.Resource;

/**
 * @author sunliang
 * @version 1.0
 * @date 2020/5/16 8:24
 */
@RestController
@Slf4j
public class CircleBreakerController
{
    public static final String SERVICE_URL = "http://cloudalibaba-payment-service";

    @Resource
    private RestTemplate restTemplate;

    @RequestMapping("/consumer/fallback/{id}")
//    @SentinelResource(value = "fallback")//没有配置 第一种情况
//    @SentinelResource(value = "fallback",fallback = "handlerFallback")//fallback 只负责业务异常
//    @SentinelResource(value = "fallback",blockHandler = "blockHandler")//blockHandler只负责sentinel控制台配置违规
    @SentinelResource(value = "fallback",fallback = "handlerFallback",blockHandler = "blockHandler",
    exceptionsToIgnore = {IllegalArgumentException.class})//blockHandler只负责sentinel控制台配置违规
    public CommonResult<Payment> fallback(@PathVariable Long id)
    {
        CommonResult<Payment> result = restTemplate.getForObject(SERVICE_URL+"/paymentSQL/"+id,
                CommonResult.class,id);
        if(id == 4)
        {
            throw new IllegalArgumentException("IllegalArgumentException,非法参数异常....");
        }else if (result.getData() == null ){
            throw new NullPointerException("NullPointerException,该ID没有对应记录，空指针异常");
        }

        return result;
    }

    //本例是fallback
    public CommonResult handlerFallback(@PathVariable Long id,Throwable e)
    {
        Payment payment = new Payment(id , "null");
        return new CommonResult(444,"兜底异常handlerFallback,exception内容 "+e.getMessage(),payment);
    }

    //本例是blockHandler
    public CommonResult blockHandler(@PathVariable Long id, BlockException blockException)
    {
        Payment payment = new Payment(id,"null");
        return new CommonResult(445,"blockHandler-sentinel限流，无此流水：blockExcepiton" +
                blockException.getMessage());
    }

    //-------------------------openfeign
    @Resource
    private PaymentService paymentService;

    @GetMapping(value = "/consumer/paymentSQL/{id}")
    public CommonResult<Payment> paymentSQL(@PathVariable("id") Long id)
    {
        return paymentService.paymentSQL(id);
    }
}
